The Plotter

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THE
PLOTTER

CLACKAMAS COMPUTER APPLIED
TRAINING SOCIETY

NEWS LETTER
KKKK

VOLUME 12 ee NUMBER 4
RKKKKE

APRIL 1994
EDITED BY: DICK WAGNER
CHAIRMAN: JACK ARMSTRONG
V/CHAIRMAN: BILL DUNLOP
SECRETARY : DICK WAGNER
TREASURER: ROD GOWEN
PR OFFICER: BOB EVANS
LIBRARIANS: BILL DUNLOP

ALICE DUNLOP
SSS

MEETING

The APRIL meeting will be:

@ om: SUN., APRIL 16, 1994

MEETING 2:00 TO 5:00 P.M.
at: Rod Gowen's home
14784 S. Quail Circle
Oregon City

a a eee
WHAT YOU WILL FIND IN THIS ISSUE:

MEETING—<====3 334433 50045==5 PAGE 1
FROM THE EDITOR'S DESK------ PAGE 1
CONTINUED--------- PAGE 2

PRINTERS, PRINTERS---------- PAGE 2
CONTINUED---PAGES 3,4

A COCHROACH STORY--=-------- PAGE 4
CONTINNUED-------- PAGE 8

TWELVE COINS---------------- PAGE 5
CONTINUED--------- PAGE 6

RMG UPDATE NEWS------------- PAGE 7
NOTICE----------------=------ PAGE 8
ADS /SUBSCRIPTION------------ PAGE 8

FROM THE EDITOR'S
| DESK

This month we present an article on
bubble type printers’ that can
produce very good results comparable
to many laser type printers. This is
a comprehensive review that makes
good reading.

I spotted the little quiz about
cockroaches in our local newspaper
and proceded to turn it into a
Sinclair BASIC program after I had
tried out my solution on paper. If
the reader tries for a_ solution
before looking at my program it
makes it more interesting (for those
who program in BASIC). For GWBASIC
fans there is a solution in that
language. Depending on space, there
might be a solution in QBASIC this
month also, or it may be carried
over to next month.

G@LACKAMAS

SSPSLSPSSPSSSSSSSESSS—1 SBSESSESSESESESBSESESE5ESES5ES

We are ready to print up our first
run of THE BEST OF THE PLOTTER. For
those readers who are relatively new
to our little user group we decided
that there was a lot of original
material (developed by members) in
our many issues’ of 10 £years
publishing that might be of interest
to members of other user groups as a

personal reference, and also to
individuals who subscribe to our
newsletter. Back in the early days

with T/S 1000 and ZX 81 computers,
the 2040 printer, and a little added
memory, we started our first issue.
After a few tries at a good page
layout we developed the early
graphics we still use on the front
page. The plotted image was within
the range of those early devices.
Since changing over to large
printers it has been a challenge to
duplicate this simple image. Which
brings up a point, should this image
be modernized or left as is? Early
day Sinclair users will recognise
this graphic as a bouncing ball. Our
2-cat logo came a little later. It
was reduced from a large drawing and
remained the same over the years. I
tried a printer graphic program for
large printers but it just didn't
look the same.

Surprisingly, the Twelve Coin puzzle
has generated a great response from
one of our readers, George Chambers
of the Toronto user group. Just key
in his program and try to beat his
score of 4 weighings. I figure that
under the best of conditions,
testing with 2 coins which can prove
10 coins are good, a second test
with one of these 2 coins against
one of the 10 good ones can prove
which one is counterfeit.

PRINTERS, PRINTERS

by: Rod Gowen

Have any of you looked at the new
generation of computer printers
lately? If not, you may be in for
some surprises. Some good, some bad!
As a dealer who likes to keep” up
with what is happening in the world
of computers so that I can better
serve my customers, I have occasion
to try out various printers from
time to time. As a user, I like to
know if there is something out there

that can help my _ printing look
better. For these reasons as well as
just plain curiosity, I recently
tried out a couple of new printers
just recently released by Citizen
America.

The first one I tried out was’ the

ProJet II, an inkjet printer that is
100Z compatible with the HP Deskjet
family of printers. This is a_ nice
looking, streamlined printer’ that
boasts a lot of features. It comes
standard with a 7® sheet automatic
sheet feeder, 128K buffer (expand-
able to 384K via a simple top-of-
printer plug in memory cartridge), 6
built-in fonts, 30@dpi resolution
maximum, easy to set "switches" and
quiet <48dba operation. It comes
complete with paper input tray,
output tray, manual, Windows driver
disk and a printhead/ink cartridge.
Quite a package!

I opened the box
and started setting it up. I put it
on the desk, installed the paper
input tray and catch tray. I then
installed the printhead/ink cart-
ridge and was ready to try it out.
The installation of the printhead/
ink cartridge was easier than I had
expected it to be. It was merely a
matter of lifting the top cover of
the printer, moving the head bracket
to the extreme right of its travel,
inserting the printhead/ink cart-
ridge straight down into the bracket
and pressing it toward the front of
the printer until a click was heard.

When it arrived,

oO

A note here about the printhead/ink
cartridge may - be in order here. J
Unlike the HP and Canon inkjet
printers, the ProJet II uses a
separate printhead and ink
cartridge. With the HP and Canon,

BY

each time you toss the cartridge,
you are also tossing the printhead.
This may be good or bad depending
upon your point of view, I guess. If
you look at it from the standpoint
of reliability, I guess changing the
printhead every 300-580 pages would
always insure that you have avery
clean set of ink jets. From the
standpoint of cost, this raises the
cost per page by more than 28Z! RMG
sells the printhead/ ink cartridge
combo for the ProJet II for $35 and
the 2 pack of ink cartridges’ for
$22.50. The HP or Canon Cartridges
are about $28-35 depending on where
you~ get them. If you figure a
minimum of 30@ pages per cartridge
and 3608 pages per printhead on the
ProJet II, you come up with a_ cost
per page of approximately 7 cents
per page while the HP would be about

9.5 cents per page. These prices
include 1/2 cent per page of paper.
The cost of the printers are quite

Similar. You could probably find an
HP 50@ for about $300 and the Projet
II can be found for about the’ same.

I found the setting of the

Overy easy. The ProJet has a covered
"bar" across the middle of the
printer under the top cover’ which,
when opened, exposes a series of
"slides" that can be moved’ forward
or backward. These slides’ control
the font selection, the density and
all of the other familiar things we
like to adjust and customize on our
printers. To turn one "“on", one
simply slides it toward the rear of
the printer. After they are all set,
you close the cover on the bar. and
the top cover, reset the printer and
it will operate with the new
"defaults". The slides are not
switches, they are simply nylon pins
that stick out and, when the print
head moves back and forth on
initialization, a small "reader" or
sensor "reads" the pins’ sticking
out. A unique and easy way to do it!

options

Now that I was ready, I turned the
printer on while holding down the LF

G@Qqpbutton and it started its self-test.

After printing out a half dozen
pages or. so, it stopped and I
examined the results. Impressive, to
say the least! What a difference 300
dpi makes.

I then plugged it into my computer
and tried printing something from a
text editor. I found out rather
quickly that this is where the BIG
difference lies in using the _ new
breed of printers! The escape codes

built into the software I was using
were not recognized by the printer.
I went to the book and-~ soon found

that one almost had to be a graphics
programmer to get the printer to do
what you wanted from BASIC or by
using escape codes. I soon gave this

up and loaded Windows, went into
WRITE, a Windows text editor, and
entered some sample text lines’ and

printed them out with full success.
It would seem that, as long as you
only want to use the ProJet Il to
print from software that supports
the HP Deskjet family of printers,
you will have no problem with this
fine printer.

The second printer I want to tell
you about is the Citizen GSX-220 24
Wire dot matrix printer. This is the
newest release from Citizen. This
printer is the first dot matrix that
I have seen that would do 360x36@dpi
resolution! They have re-designed
the printhead to a diamond shape
instead of the’ usual "in-line"
wires. This evidently prolongs’ the
life of the head as well as bringing
the noise level down to an
unbelievable <48dba! This is also
the first dot matrix printer that I
have seen shipped standard with a 56
sheet automatic sheet feeder and
made the tractor feed optional!

After receiving the printer, I set
it up per the “Quick Start"
instruction sheet and _ liked the
looks. The ribbon is the same as for

all models for the past 2-3 years.
The top load ASF (automatic sheet
feeder) is different but it works
fine. The optional tractor feed
Simply snaps into the back of the
printer and it allows for paper
parking. The real noticeable

difference that I
was the fact that

immediately saw
there was no

platen knob on either side of the
printer! There is a thumb wheel for
moving paper under the top cover.

Otherwise, the book recommends using
the LF/FF and PARK to do your’ paper

moving.

This printer is unique in another
way--it has NO DIP SWITCHES! All of
the settings are done via the

VUE-PRINT MENU or from a program in
your PC that will download your
macro with all the settings in it to
the printer. If you are not using a
PC you would have to use the
VUE-PRINT MENU. This is Citizen's
engineers try at "making it easier"
to set the printer up. To use it,
you press and hold the PARK button
on the control panel for 3. seconds.
The printer will then print the
first menu option and the choices
for that option. In this case, the
first option is type of emulation.
The choices are EPSON, IBM or AUTO.
The printed line will have one of
the choices underlined. This is the
current’ setting. To change the
setting you press the ON-LINE button
and the print head moves to the
right of each choice in its’ turn.
When the one you want is just to the
left of the print head, you press
the LF/FF button and that choice is
written into the printer's ROM and
the printer prints the next menu
option. It took me about 5 minutes
to set or reset all of the options
available via this menu.

I then ran the self-test and was
amazed at the resolution. It comes
real close to an inkjet. I proceeded
to hook it up to my computer and,
even though the book said it was
EPSON LQ compatible, it would not
accept the escape codes from my text
editor any better than the ProJet
had! It may have been defective or
something 1 was doing wrong, but I
decided, after 3@ minutes on the
phone to Citizen tech support, to
give up and test it from software
that supported the GSX-24@ Citizen
printer from Windows and it worked
perfectly.

I think that what I said about’ the
ProJet II goes here as well--if you
are just going to use it from
software that supports it, it will
do a GREAT job. However,
to send escape codes, be sure you
are prepared to do some trial and
error programming. At about $25@ or
less, this is a real nice printer.

if you want

If you would like more info (spec
sheet or exact pricing) you can send

a business (#10) S.A.S.E. to RMG at
the address on the’ back of this
newsletter or give us a call.
A COCKROACH STORY
by Marilyn vos Savant
This little story by Marilyn

appeared in our Sunday paper. You
are to come up with the answer as
requested at the end. It is an easy
one to convert into a computer
program to get the answer.

You wake up in the middle of the
night and are seized with the urge
to fry up a nice pork kidney. As you

turn on the light in the kitchen,
though, you see a platoon of 25
cockroaches marching across the

floor. Because you're a professional
exterminator, you don't hesitate to
take action. First, you grab a
frying pan and mash one-fifth of
them with it. As they begin to
scatter, you leap out of the way and
bang your head on the bottom of an

overhead cabinet, sending a shower
of dishes to the floor, which
crushes one-fourth. Jumping

backward, you accidently upend the

kitchen table, which smashes
one-third flat. Grasping the frying
pan again, you raise it over your

head threateningly, taking out the
overhead light, which crashes to the
floor, squashing one-half. Then the
cat strolls in and eats the
remainder.

As you stand quietly by and listen
to her little crunching noises, you
notice that each action annihilates
the same number of roaches-—-which
doesn't make sense to you, based on
the above fractions. How can you
explain it?

The Editor's answer
elsewhere in this newsletter, after
you enter the program in either
Sinclair BASIC or GWBASIC. Of course
T/S 1000 users are also welcome to
try a program for this little
puzzler.

appears

oO

C)

(weighed more, eliminating I-L.

THELVE COINS

Dick F. Wagner

our
equal
was a

We received a nice reply to
puzzle about 12 coins of
denomination but one

counterfeit. With a balance,
determine which is the counterfeit
coin, bearing in mind that this coin

can be lighter or heavier than _ the
others.
George Chambers from the Toronto

Timex Sinclair Club took the time to
develop a program to do just that,
all the user has to do is to put in
the coins for the program to test.
As the intent is to do this with the
least number of weighings, group
weighings are required. George
claims to obtain an answer is 4
tests. I tried several times and
obtain the correct answer in 5
weighings. I stumbled for a while on
the fact that the computer only
tells which side of the balance is
heavier, not because one side had
the heavier coin. In other words,
one side could have the coins on the
balance all equal and the other side
could have a heavy coin, making it
the heavy side, or it could have a
light coin, making the side with
equal weight coins heavy--tricky!

As the program takes up a little
more than a page, we include it in
this issue. Please note that while
the program is saved to LKDOS, line
9000 is the only line requiring
adjustment for the user's’ storage
method. We thank George, and also
Don Lambert for their contibutions.

After trying the program for while,
I discovered that I was really
trying to analyze my steps, not just
a haphazard punching of keys. Be
sure and make notes of your steps to
help you study the problem.

A run that required 7 tries went
like this: weigh 4 coins A-D against
E-H to test for equal weight and/or
eliminate I-L. The result was A-D
Test
A,B against C,D with results equal.
This leaves E,F to test against G,H.
E,F tested more so it might have a
heavy coin, or G,H might have a

light coin. I made a mistake of
selecting C,D (equal weights) to
test against E,F. E,F tested equal
leaving G and H. Weighing G against
H was another error of judjment as
I lacked a standard. Anyway, I still
didn't have a good answer until the
7th test when I tested H against C
with equal weights so that left G as

either heavier or lighter, but
conterfeit anyway.
5 REM
10 REM TWELVE COINS PUZZLE
20 REM Written by
G. Chambers
14 Richome Ct.
Toronto, Ont
CANADA M1K 2Y1
30 REM JANUARY 1994

40 REM It takes me 4 balances.
Can you do better? GFC
I think it is probably possible.

50 GO SUB 700
60 LET W=0: LET P=0: POKE 2365
8,8: DIM A(12): DIM D$(64)
70 INPUT “Do you want instruct
ions?";ig$: IF i$<>"Y" OR I$<>"N"
THEN GO TO 80
80 IF I¢$<>"Y" AND I$<>"N"
GO TO 70
90 IF i$="“Y" THEN GO SUB 1000
100 FOR N=1 TO 12
110 LET A(N)=10
120 NEXT N
200 LET R=INT (CRND*¥11)+1.5)
210 LET S=INT ((RND*2)+9.5): IF
S=10 THEN GO TO 210
220 LET ACR)=S

THEN

300 GO SUB 700: DIM Z$(12): LET
W=W+1
305 PRINT Select the coins (

A to L) you wish to place on the
LEFT tray of the balance scale
“ " Press ""X"" to terminate en

tries."

307 PRINT TAB 10;

."sW

310 PRINT AT 7,0;"COINS PLACED"

"“LEFT TRAY: "’’: LET R=0
320 FOR N=1 TO 12
330 BEEP .05,40: INPUT X$: IF X

$="X" THEN LET N=12: GO TO 380
340 IF X$>"L" OR X$<"A" GR CODE
X$=0O THEN GO TO 330
350 GO SUB 800

355 PRINT AT 18,0;D$;AT 24-P,N*

23

INK 1;"“Test N
fe)

360 LET X=(CODE X$-64): IF X=-3
2 THEN LET X=0O: PRINT AT 24-P,(N
-1)*2;: GO TO 330

370 PRINT INK 1;X$;" “3: LET R=

R+A(X)

380 NEXT N

390 PRINT : PRINT

400 PRINT “ Select the coins (

A to L) you wish to place on the

LEFT tray of the balance scale
."," Press “"“X"" to terminate en
tries.”

410 PRINT AT 7,15; "COINS PLACED
“sAT 8,15; "RIGHT TRAY: ";AT 10,1
5;: LET L=0

420 FOR N=1 TO 12

430 BEEP .05,35: INPUT X$: IF X
$="X" THEN LET N=12: GO TO 490

440 IF X$="X" THEN LET n=12: GO

TO 460

450 IF X$>"L" OR X$<"A" OR CODE

X$=0 THEN GO TO 430

460 GO SUB 800

465 PRINT AT 18,0;D$;AT 24-P,(N
*2)4+13;

470 LET X=(CODE X$-64): IF X=-3
2 THEN LET X=0O: PRINT AT 24-P,(N
*2)+13;: GO TO 430

480 PRINT INK 1;X$;" “3: LET L=
L+A(X)

490 NEXT N

500 PRINT AT 17,0;D$;AT 17,0; I
NK 1;(" The RIGHT tray weighs m
ore." AND L>R)+(" The LEFT tray

weighs more.“ AND R>L)+("Both t
rays are of equal weight." AND L
=R)

510 PRINT AT 20,0;"Press P)rint
, B)alance, C)heat; or ENTER for

new game"

520 PAUSE O

530 IF CODE INKEY$=67 THEN GO T
QO 900

540 IF CODE INKEY$=13 THEN RUN

550 IF CODE INKEY$=66 THEN CLS
: GO TO 300

560 IF CODE INKEY$=80 THEN GO S
UB 600: GO SUB 510

570 CLS : GO TO (300 AND G$="Y"
)+(560 AND G$="N")

599 STOP

600 IF SCREENS (6,10)<>"“T" THEN

CLS : GO SUB 700: GO TO 510

610 LET LINE=6: GO SUB 620: LPR
INT : LPRINT : LPRINT : LET LINE
=8: GO SUB 620: LET LINE=10: GO
SUB 620: LPRINT : LPRINT : LET L
INE=17: GO SUB 620: LET LINE=18:

GO SUB 620: LPRINT TAB 8; “***kx*
sOOKOKKK' 5 LPRINT : LPRINT : RET
URN

620 FOR N=0O TO 31: LPRINT SCREE
N$ (LINE,N);: NEXT N

630 RETURN

7OO PAPER 6: BORDER 6: CLS

710 PRINT TAB 4; INK 2;"“THE TWE
LVE COINS PUZZLE"’’”

720 RETURN

800 LET P=PEEK 23689: FOR J=1 T
0 12
820 IF X$=Z$(JIJ) THEN PRINT AT 1
8,0;D$;AT 18,0;"“You have placed
this coin in the tray already...
Select another."“: LET X$=" “: LE
T J=12: PAUSE 150: RETURN
830 NEXT J
850 FOR K=1 TO 12

860 IF Z$(K)=" “ THEN LET Z$(K)
=X$: LET K=12

880 NEXT K
890 RETURN
900 CLS : GO SUB 700: PRINT “Th
e weights of the 12 coins are as

follows:”

910 PRINT ’: FOR N=1 TO 12: PRI
NT CHR$ (N+64);TAB S:AQ(N): NEXT
N
920 PRINT ’"“PRESS A KEY": PAUSE

0: GO TO 510
1000 PRINT “ You have 12 almos
t identical coins. All are the s
ame denomin-ation. One is a cou
nterfeit, and is either slight
ly heavier or lighter than the
others"

1010 PRINT ’" Can you locate it?
You have at your disposal a bal
ance scale. Remember, a balance

has two pansso weights can be p
ut in one panto balance weights
in the other."

1020 PRINT ’" The puzzle is to

find how few weighings are neede

d."

1030 PRINT ” The coins are re

presented by the letters A to _L.
Select the coins you wish to c

ompare. "

1040 PRINT ’"Press any key to st

art the game": PAUSE O: RETURN

7999 STOP

8999 STOP

9000 RANDOMIZE USR 100: SAVE “TW

ELVE.B1" LINE 1

o

RMG UPDATE NEWS FOR APRIL 1994
VOLUME 6, NUMBER 4

** RMG NEWS **

Are you ready for summer? Our friends on the east coast and upper midwest must
surely be looking forward to some warmer weather! Having been raised and having
lived on the "Great Plains" for the first 21 years of my life, | can sympathize and am
never sorry to have moved to the west coast at that time. Here in Oregon we have
perhaps the most benign weather of the whole continental US. A bit wet at times, but no
serious extremes in temperature.

On to computers! We have a few changes this month (not many, as not much was
sold) and some new items that may be of interest. We have a 30 day special on the new
Citizen ProJet Il ink jet printer. After having one here for testing, | can tell you that this is
one nice printer. It is fully HP Deskjet compatible and is really “laser quality” at 300dpi.
Take a look at the enclosed flyer on it and see what you think. We have 1 ONLY
DEMO UNIT (used only to test out, printed about 50 sheets) that we will sell for
$270PP! If you would like the extra ink cartridge/print head with it, it will run
$300PP! It will be “first-come, first-served” on this one unit only. This is really an
inexpensive way to get into an inkjet printer that does laser quality. As you can see by
the flyer, after this one demo unit is sold, anyone who wants one of these fine printers
can still get one for only $279 plus $15 PH.

DOHANY PD DISK-—has sure drawn the interest of the LKDOS users out there! |
have filled all orders for the disks and will continue to do so. THE PLOTTER for March
carries a review of some of the utilities on this disk. The price is still only $5 (including
postage). Be sure to tell us the format you require. (5.25"/3.5", 40 track/80 track, single
or double sided). As reported earlier, THE BEST OF THE PLOTTER is still in progress
and should be ready in a month or two. We are down to the last few changes in layout
and will then be getting the masters ready so we can have it printed. We will keep you
posted here and in THE PLOTTER as too our progress on this project.

It seems that all of the newsletter editors are having the same problem, that is, the
lack of original material to publish. It seems to be the same old story, you folks like to
read the articles and newsletters as long as you don't have to do anything to help get
the information into it. Just stop and think of how you would feel if you were hapless
enough to be given the job of newsletter editor and then realized that there would be
very little help forthcoming from the membership/readership at large! | try to do my part.
if you look at any copy of THE PLOTTER, the monthly publication of CCATS group, you
will find two names prevalent, mine and Dick Wagner's. Dick is the editor and | am the
former editor. What does that tell you? C'MON FOLKS! LETS HELP OUT THESE
BELEAGUERED STALWARTS OF THE PUBLISHING INDUSTRY! SEND IN
SOMETHING THAT WE CAN PRINT!

KEEP WATCHIN' FOR MORE NEWS! Rod Gowen, Owner, RMG Enterprises
14784 South Quail Grove Circle, Oregon City, OR 97045
503/655-7484 8AM-6PM PT * FAX/VOICEMAIL: 503/655-4116 24 HRS

: ‘4
.
‘

PPOPPDOPODPOPDOPGSOSPSCHCPPSSSCOSOPCPCSOSPOCCSCHPCCPCCOCPDDPDD

—-NOTICE—

4 REM Dick Wagner 3/27/94 Opinions expressed in articles are Wy
5 REM the answer to the not necessarily those of members’) of
cockroach story in this issue. the Clackamas Computer Applied
6 PRINT " XXX KKKKKKKKKKKKEKEK Training Society ~. Meeting minutes
AKKKKKKKKKKK KANSWER TO THE COCK carry the consensus of members
ROACH STORY* **XXXAKKKKKKKEKKKKK present at meeting. This newsletter
KRKAKKKKKKKERN nor staff will not be held liable for
7 PRINT : PRINT any damage or consequences due
10 LET A=25 to following instructions, or review of
20 LET B=A-1/5%*A products as contained in this newsletter

30 LET C=B-1/4*B

40 LET D=C-1/3*C

50 LET E=D-1/2*D

55 PRINT "25 COCKROACHES MARCH
ING ACROSS THE FLOOR"

60 PRINT : PRINT “YOU KILL ";A SUBSCRIPTION RATES
=e" WITH PRYING PAN" 0 7 eg Te

70 PRINT “YOU KILL ";B-C;" WIT FREE SUBSCRIPTION WITH PAID
H DISHES" CCATS MEMBERSHIP-$20.00/YR

80 PRINT “YOU KILL ";D-E;" WIT $0 OSS SSS SS SS SS eK SSeS Se Sa
H KITCHEN TABLE" PLACE YOUR AD HERE

90 PRINT "YOU KILL ";B;" WITH 0 RR meee
KITCHEN LAMP" AD RATES

100 PRINT "THE CAT EATS";" ";A- KK
1/5*A-1/4*B-1/3*C-1/2*D;" COCKRO 1 FOUR LINE CLASSIFIED FREE
ACHES" WITH MEMBERSHIP Gx

110 PRINT : PRINT " TR 000000 PRB ee =
E END" $ ~50 / LINE

$ 5.00 / 1/4 PAGE
$ 8.00 / 1/2 PAGE
$ 15.00 / FULL PAGE

ALL AD COPY MUST BE IN BY
THE 10TH OF THE MONTH PRIOR
TO THE MONTH AD IS TO RUN.

POHDOODDSDOSDOSDSDSOPOPGDHD —-8—- DODOSDSDOPSDOSOSDOCPPOCD

CCATS

14784 S. Quail Grove Circle
Oregon City, OR 97045

ROD GOWEN (TREAS./V. CHAIRMAN)

14784 S. QUAIL GROVE CIRCLE

OREGON CITY, OR 97045

A0003:12<94/ML : J